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M. A. Nelson, E. R. Pardyjak, J. C. Klewicki, S. U. Pol, and M. J. Brown

densities in a single urban street canyon to explore the details of the mean flow characteristics and turbulence statistics of the flow within a North American–style street canyon embedded in an urban core. The spectral characteristics of the flow in this street canyon over the same time periods are explored in Nelson et al. (2007 , Part II of this paper). 2. Observation site and instrumentation The Joint Urban 2003 (JU2003) field campaign was performed from 29 June through 30 July 2003 in Oklahoma

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Julia E. Flaherty, Brian Lamb, K. Jerry Allwine, and Eugene Allwine

transverse Mercator grid zone 14, North American Datum 1983), while 8th Street is directly north of the crane site, at approximately 3926850 m northing. Figure 10 presents the concentrations measured during IOPs 8 and 9. For these two nighttime IOPs, the mobile van remained on 8th Street for the duration of the experiment. These concentration curves are superimposed on a map of the city to show the physical relationship among the release location, the crane site, and the plume. Variations in the tracer

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P. Ramamurthy, E. R. Pardyjak, and J. C. Klewicki

the southeast corner of the building labeled the “sonic building” in Fig. 2 . The universal transverse Mercator (UTM) coordinates of this coordinate system origin are 634 768.8 m east and 3 926 053.4 m north [for zone 14 of the North American Datum of 1983 (NAD83)]. As described in detail by Nelson et al. (2007a) , the average building height for the Park Avenue street canyon was H ∼ 50 m, while the canyon length and width were L ∼ 1 57 m and W ∼ 25 m, respectively (see Fig. 2 ), yielding

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M. A. Nelson, E. R. Pardyjak, M. J. Brown, and J. C. Klewicki

potential to advect vortices shed from the roofs of the buildings on the upwind side of the canyon down into the canyon interior (for the southeasterly case). This hypothesis is supported by the results Eliasson et al. (2006) , who found that eddies frequently penetrate the shear layer at the top of a European street canyon, which has more or less uniform building heights, disturbing the typical street canyon flow patterns. In the case of a North American–style street canyon such as PA, with

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Eric A. Hendricks, Steve R. Diehl, Donald A. Burrows, and Robert Keith

configuration of all samplers for each release configuration is shown in Fig. 3 . These are all surface samplers. A comparison was also made to the WSU vertical profiler, and this is discussed in section 5b . The vertical profiler was located approximately 1.2 km north of the Botanical Gardens (not shown in the maps in Fig. 3 ). c. Method of comparison Comparisons are made at the discrete locations of the samplers. The quantity used in the comparison is the release mean concentration, defined as the time

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